How to lock a file (encrypt?) and prevent opening it until x date/time?

Hi
I'm trying to find an application that will allow a file to be locked (whether that be encypted, etc) until a date.

So for instance, if I have a 'diary' file that I want to prevent being opened until 2020.

How would I go about doing that?
Mystical_IceAsked:
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Dave HoweSoftware and Hardware EngineerCommented:
You can't.
All you can really do is lock with a digital key, then give the key to a third party to be held until the release date.
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McKnifeCommented:
Your example does not show your problem. Who would you try to keep from seeing the data, why can't you keep the key yourself (in memory or written down and hidden) until 2020?
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EirmanChief Operations ManagerCommented:
If this is related to a message to be given after death, you could use one of these services ....
http://www.thedigitalbeyond.com/online-services-list/

You could of course, encrypt the file and give it to whoever you want to read it. Then give the password to a solicitor/lawyer ..... or use multiple passwords and multiple holders.

You can have multiple passwords with truecrypt (which can still be downloaded)
or use a bestcrypt container where for example, any 3 out of 5 passwords can decrypt the container.
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Mystical_IceAuthor Commented:
This answers my problem
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